The finch with the big leg tumor is back, so he's not dead yet. But I took a bunch of photos this afternoon, and it looks like he may have another one starting right near his right eye, so I fear for him. There's another finch whose other leg is affected - I can't tell how badly, but she sat all hunkered down for the afternoon, not standing with her legs straight out, and I wonder if it's due to the tumor.
I'll eventually post the photos; don't want to process them tonight. (The first finch is definitely male - his color is starting to come in!)